Assertion : A body that is a good radiator is also a good absorber of radiation at a given wavelength.
Reason : According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength

(A) : A body that is a good radiator is also a good absorber of radiation at a given wavelength. ( R) : According to Kirchoff's law the absorptivity of a body is equal to its emissivity at a given wavelength.

Assertion : Good absorbers of radiation are weak emitters. Reason : Ratoi of emissivity and absorptivity is constant for all substances at any temperature for same wavelength radiation.

A body, which emits radiations of all possible wavelengths, is known as

A body, which emits radiations of all possible wavelengths, is known as

The Kirchhoff's law leads to the conclusion that the good radiators of thermal radiations are

Assertion(A) Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason(R) The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.

Assertion(A) Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason(R) The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.